Moto Assist and Google Voice?

I got the new Moto X Pure Edition last week, and I have it set to read text messages and tell me who is calling. The problem is, I've gotten plenty of calls and texts while driving, but the Moto Assist app doesn't read anything or let me know who is calling. I have my calls go through Google Voice and my texts go through Voice/Hangouts. Is this the reason I haven't gotten anything through the Assist app?